/Engine/Plugins/VirtualProduction/DMX/DMXPixelMapping/Source/DMXPixelMappingRenderer/Public/DMXPixelMappingPreprocessRenderer.h
Returns the desired output size, or an unset optional vector 2D if the resulting size should be used
[TOptional](API\Runtime\Core\IO\TOptional)< FVector2D > GetDesiredOutputSize2D() const